I acquired a 97' 200 efi. Power head was rebuilt. Oil reservoir removed ( must add oil to gas, advanced timing module removed. . supposedly replaced impeller. Boat/ motor has been sitting 8 months. Owner says he cranked it on muffs a couple times over that period. I put fresh gas 10 gal. And a qt. Of oil, and pint of sea foam and it cranked right up. Ran fine. After 10 min. Steady alarm came on. I shut it down waited 30 seconds restarted... No alarm. Ran at 3000-35000 rpm for a other 10 min. Alarm again. ( 12 psi at idle,15 psi engaged, 20 psi at 3500 rpm. ) shut down and immediately restarted... No alarm. Repeat as above. When alarm came on I left engine running maybe a min before shutting off then restarted immediately and no alarm. Pulled bowling heard no steaming or crackling as if engine was hot. Then the last 15+ min of my break in run no alarm. Next day only one alarm during break in perod. I would think if it was impeller my psi would be weak. I'm thinking it has something to do with disconnect of oil pump or the power packs Any advice appreciated.